yes you need to have gauges and along with your egt eot ect you want to watch your fuel psi and ficm volts i have a write upon a flush that will leave the inside of your block shining it takes the better part of a day but its the peice of mind that you will have after you do it and if i was you i wouldnt do a new oil cooler id save up the cash and do a oil cooler delete and never worrie about it again theres two out there that ive seen, one im buying bullet proof diesel and inovation have them and if you havent bought your egr delete yet pm me i will send you a link and get it cheaper and just the same thing half the price so dont spend $300 things on theses truck cost enough when you can get a deal take it but always research it first and then see whos used it heard of it and so on and a good investment to work on your truck is a top creaper standing on a chair or bucket sucks after doing my delete my gut hurt for 2 days so anyhow good luck
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